Matt Morrison developed NAT Gateway IP management for unmanaged networking in the spectrocloud/cluster-api-provider-aws repository. He introduced the updateNatGatewayIPs function, which encapsulates the retrieval, updating, and tagging of NAT Gateway IPs when network resources are not managed by the cluster API. Using Go and leveraging AWS cloud infrastructure, Matt focused on creating robust, idempotent update flows to prevent configuration drift and ensure correct NAT IP management. His work improved the maintainability and traceability of networking features, aligning with existing architectural patterns and tagging strategies. This feature enhanced automated network management reliability in complex, unmanaged AWS environments.